BackgroundImageControl.java Source code

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Here is the source code for BackgroundImageControl.java

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/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

/*
 * Control example snippet: set a background image (a dynamic gradient)
 * 
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.2
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

public class BackgroundImageControl {
    static Image oldImage;

    public static void main(String[] args) {
        final Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setBackgroundMode(SWT.INHERIT_DEFAULT);
        FillLayout layout1 = new FillLayout(SWT.VERTICAL);
        layout1.marginWidth = layout1.marginHeight = 10;
        shell.setLayout(layout1);
        Group group = new Group(shell, SWT.NONE);
        group.setText("Group ");
        RowLayout layout2 = new RowLayout(SWT.VERTICAL);
        layout2.marginWidth = layout2.marginHeight = layout2.spacing = 10;
        group.setLayout(layout2);
        for (int i = 0; i < 8; i++) {
            Button button = new Button(group, SWT.RADIO);
            button.setText("Button " + i);
        }
        shell.addListener(SWT.Resize, new Listener() {
            public void handleEvent(Event event) {
                Rectangle rect = shell.getClientArea();
                Image newImage = new Image(display, Math.max(1, rect.width), 1);
                GC gc = new GC(newImage);
                gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
                gc.setBackground(display.getSystemColor(SWT.COLOR_BLUE));
                gc.fillGradientRectangle(rect.x, rect.y, rect.width, 1, false);
                gc.dispose();
                shell.setBackgroundImage(newImage);
                if (oldImage != null)
                    oldImage.dispose();
                oldImage = newImage;
            }
        });
        shell.pack();
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        if (oldImage != null)
            oldImage.dispose();
        display.dispose();
    }
}